you might have fixed this, but I've noticed that when you jump there seems to be momentum carried through. And when platforming, this makes everything feel a bit slippy, especially when you're trying to do a series of jumps and slide off the final platform without the jump key taking effect.
I've also found that momentum is weird when trying to reposition in the air, with the character feeling way too sensitive to adjustments. The ghost-jumping sections are really painful as a result.
I'm on OSX if that makes any difference.